Questions bfore installing amd64

Hello
I already have netbsd i386 installed in a partition. I want to move
to amd64 platform.
1. I could not locate the boot ISO image for amd64 port here:
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-4.0.1/amd64/installation/ .
There is only a 3.2MB (what looks like a net install) iso file here.
Where is the complete ISO image?
2. I thik this is not possible, but let me ask anyways - Can I upgrade
form i386 to amd64 in place after booting the i386 OS? How ?
3. Are the fglrx ATI binary drivers supported? I have a 780G HD3200
graphics onboard Gigabyte mobo with be-2350 cpu.
4. I ultimately want to run VirtualBox under linux emulation. Can
somebody confirm if this is known to work? This will be a showstopper
for me if not.
--
Kind Regards
GobbleDeGeek
[For everything Gobbledegook!!]